# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals

# useful for handling different item types with a single interface
from itemadapter import is_item, ItemAdapter

import redis
import requests
import json


class PeopleSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class PeopleDownloaderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class ProxyMiddleware(object):

    def __init__(self, ip, client):
        self.ip = ip
        self.client = client

    # 重写获取ip
    @classmethod
    def from_crawler(cls, crawler):
        return cls(ip = crawler.settings.get('IP_POOL'), client = cls.redis_client)

    # IP代理
    def process_request(self, request, spider):
        request.meta['proxy'] = 'https://47.104.213.89:4111'
        return None

    def process_response(self, request, response, spider):
        response.status = 202
        return response
    
    # redis_client
    def redis_client(self, config = None):
        # client
        client = redis.StrictRedis(host = 'localhost', port = 6379, db = 0)

        return client

    # redis-set
    def redis_set(self, value):
        client = self.redis_client()
        client.sadd('ip_pool',value)
        # self.client.expire('ip_pool', 50)

    # 随机返回
    def redis_get(self, key):
        client = self.redis_client()
        return client.spop('ip_pool', 1)

    # 获取一批ip
    def get_ip(self):
        ip = requests.get('http://d.jghttp.golangapi.com/getip?num=100&type=2&pro=0&city=0&yys=0&port=1&pack=29622&ts=0&ys=0&cs=0&lb=1&sb=0&pb=4&mr=1&regions=')

        data = json.loads(ip.text)
        if data['success'] == True:
            ip_pool = data['data']

            for ip in ip_pool:
                self.redis_set(json.dumps(ip))

    # 检查ip是否可用
    def check_ip(self, ip, port):
        targetUrl = "https://www.baidu.com/"

        #代理服务器
        proxyHost = "ip"
        proxyPort = "port"
 
        proxyMeta = "http://%(host)s:%(port)s" % {
            "host" : ip,
            "port" : port
        }

        proxies = {
            "http"  : proxyMeta,
            "https"  : proxyMeta
        }

        res = requests.get(targetUrl, proxies = proxies)

        status_code = res.status_code

        if status_code == 200:
            return True
        else:
            return False